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1979-1993 & 94 Conv [Subscribe to Daily Digest] |
To add to the trans-confusion:
up to 88: small pinion bearing, narrow gears
88 to 90: large pinion bearing, narrow gears
91 to 93: large pinion bearing, wider gears, narrower shift forks & syncros
For years the favorite for the hi-po crowd has been the 91+ gearbox because it has wider gear teeth in 1, 2, 3, and 4th. This helps prevent gear failure in highly boosted motors. But the wider gears ate up space elsewhere...the shift forks & syncros actually lost metal! Ham-fisted drivers can easily damage this trans, which would show up as difficulty to engage a trans that won't go into gear or that gets stuck in gear.
The '88-90 gearboxes have the better pinion bearing and the older sturdy shift forks, but the gears are a few mm's narrower than the '91-93 box. This is only a limitation if you plan for a 200+hp car (not likely for a weekend convertible!). I like this one best, but I would shot-peen and cryo treat all the gears for maximum strength -- I'm pushing high hp.
The early boxes shift well and have the possibility of being upgraded to the larger pinion bearing, available through Eriksson Industries (see link). With this upgrade they are basically the same as the '88-90 boxes.
There are other variables like final drive ratio, which was either 3.67:1 (early models) or 3.89:1 (later models). There are a few different ratios on the input chain drive also - most common are #6 (teeth 31:26 ratio=.84) and #7 (teeth 32:25 ratio=.78). By now you could have a car with a mix-and-match of various parts (like mine!). These details may not seem important, but the effects are noticeable and annoying when you are cruising at 75mph and you have 4200rpms and it should be 3000rpms!!
Good luck with the convertible search. DS
posted by 63.207.93...
, Wed, 13 Oct 2004 20:33:11
, Thu, 14 Oct 2004 05:21:03
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